SRJC_2008 JC2 Prelim H2 Paper 1 with answer key

1 SERANGOON JUNIOR COLLEGE General Certificate of Education Advanced Level Higher 2 CHEMISTRY 9746/01 Preliminary Examination 28th Aug 2008 Paper 1 Multiple Choice 1 hour Additional Materials: Data Booklet Soft clean eraser Soft pencil (type B or HB is recommended) OMR Answer Sheet READ THESE INSTRUCTIONS FIRST Write your name, index number on the OMR Answer Sheet in the spaces provided. Write in soft pencil. Do not use staples, paper clip, highlighters, glue or correction fluid. There are fourty questions in this paper. Answer all questions. For each question, there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate OMR answer sheet. Read very carefully the instructions on the OMR answer sheet. You are advised to fill in the OMR Answer Sheet as you go along; no additional time will be given for the transfer of answers once the examination has ended. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this question paper. You may use a calculator. This document consists of 18 printed pages and 0 blank page. SRJC 2008 9746/01/Prelim/2008 [Turn Over

2 Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 In a titration experiment, 30 cm 3 of 0.05 mol dm -3 phosphorous acid, H 3PO3 was found to exactly neutralise 15 cm 3 of 0.20 mol dm -3 aqueous sodium hydroxide. Using this information, deduce the formula of the salt formed in the neutralisation process. A NaH2PO3 B Na2HPO3 C Na3PO3 D Na3PO4 2 G is an element in period 4 of the periodic table. The ionisation energies of the first 13 electrons in element G is plotted against the order of removal of electrons as shown in the diagram below: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Order of electrons removed from X Log (Ionisation Energy) What is the formula of the compound formed when G reacts with oxygen? A GO B GO2 C G2O D G2O3 3 Which graph is obtained when pV is plotted against density, ρ, for a fixed amount of an ideal gas at constant temperature? SRJC 2008 9746/01/Prelim/2008 [Turn Over Order of electrons removed from G

C H H C H N H H C O OH I I OHO I I qp r s 3 A B C D 4 The thyroid gland concentrates iodine and uses it to produce thyroxine, which is a hormone that controls the metabolic rate. Thyroxine What are the values of the bond angles p, q, r and s? p q r s A 180° 90° 180° 90° B 105° 109.5° 107° 120° C 180° 90° 120° 180° D 105° 90° 107° 180° 5 2-bromopropane undergoes nucleophilic substitution with aqueous NaOH via the following mechanism. SRJC 2008 9746/01/Prelim/2008 [Turn Over pV ρ pV ρ pV ρ pV ρ

4 H3C C H Br CH3 C H CH3 H3C + Br-slow C H CH3 H3C + OH- H3C C H OH CH3 fast Which of the